igneous
Vesicular volcanic rock (likely scoria)
Scoria, basaltic to andesitic volcanic rock
AI-generated identification · may be incorrectRough, reddish-brown, and highly vesicular, with dark mineral-rich patches. Typically composed of plagioclase, pyroxene, and iron oxides; hardness about 5–6 Mohs, with no distinct cleavage. The image alone does not establish its exact composition or density.
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Physical properties
Rough, reddish-brown, and highly vesicular, with dark mineral-rich patches. Typically composed of plagioclase, pyroxene, and iron oxides; hardness about 5–6 Mohs, with no distinct cleavage. The image alone does not establish its exact composition or density.
Formation & geological history
Forms when gas-rich lava cools rapidly, trapping bubbles in a solid volcanic matrix. It is generally geologically young, though scoria occurs in volcanic deposits of many ages.
Uses & applications
Used as lightweight aggregate, landscaping stone, drainage material, and sometimes in decorative collections.
Geological facts
Scoria’s abundant gas cavities distinguish it from many dense volcanic rocks; reddish coloration commonly reflects oxidized iron.
Field identification & locations
Look for a rough, porous texture and often dark or rusty-red color; it occurs near cinder cones and lava flows worldwide. The pictured specimen’s identity is provisional without closer examination.
